Return to longlong.m4 CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libiconv / srcm4

Annotation of embedaddon/libiconv/srcm4/longlong.m4, revision 1.1

1.1     ! misho       1: # longlong.m4 serial 14
        !             2: dnl Copyright (C) 1999-2007, 2009 Free Software Foundation, Inc.
        !             3: dnl This file is free software; the Free Software Foundation
        !             4: dnl gives unlimited permission to copy and/or distribute it,
        !             5: dnl with or without modifications, as long as this notice is preserved.
        !             6: 
        !             7: dnl From Paul Eggert.
        !             8: 
        !             9: # Define HAVE_LONG_LONG_INT if 'long long int' works.
        !            10: # This fixes a bug in Autoconf 2.61, but can be removed once we
        !            11: # assume 2.62 everywhere.
        !            12: 
        !            13: # Note: If the type 'long long int' exists but is only 32 bits large
        !            14: # (as on some very old compilers), HAVE_LONG_LONG_INT will not be
        !            15: # defined. In this case you can treat 'long long int' like 'long int'.
        !            16: 
        !            17: AC_DEFUN([AC_TYPE_LONG_LONG_INT],
        !            18: [
        !            19:   AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
        !            20:     [AC_LINK_IFELSE(
        !            21:        [_AC_TYPE_LONG_LONG_SNIPPET],
        !            22:        [dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
        !            23:        dnl If cross compiling, assume the bug isn't important, since
        !            24:        dnl nobody cross compiles for this platform as far as we know.
        !            25:        AC_RUN_IFELSE(
        !            26:          [AC_LANG_PROGRAM(
        !            27:             [[@%:@include <limits.h>
        !            28:               @%:@ifndef LLONG_MAX
        !            29:               @%:@ define HALF \
        !            30:                        (1LL << (sizeof (long long int) * CHAR_BIT - 2))
        !            31:               @%:@ define LLONG_MAX (HALF - 1 + HALF)
        !            32:               @%:@endif]],
        !            33:             [[long long int n = 1;
        !            34:               int i;
        !            35:               for (i = 0; ; i++)
        !            36:                 {
        !            37:                   long long int m = n << i;
        !            38:                   if (m >> i != n)
        !            39:                     return 1;
        !            40:                   if (LLONG_MAX / 2 < m)
        !            41:                     break;
        !            42:                 }
        !            43:               return 0;]])],
        !            44:          [ac_cv_type_long_long_int=yes],
        !            45:          [ac_cv_type_long_long_int=no],
        !            46:          [ac_cv_type_long_long_int=yes])],
        !            47:        [ac_cv_type_long_long_int=no])])
        !            48:   if test $ac_cv_type_long_long_int = yes; then
        !            49:     AC_DEFINE([HAVE_LONG_LONG_INT], [1],
        !            50:       [Define to 1 if the system has the type `long long int'.])
        !            51:   fi
        !            52: ])
        !            53: 
        !            54: # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
        !            55: # This fixes a bug in Autoconf 2.61, but can be removed once we
        !            56: # assume 2.62 everywhere.
        !            57: 
        !            58: # Note: If the type 'unsigned long long int' exists but is only 32 bits
        !            59: # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
        !            60: # will not be defined. In this case you can treat 'unsigned long long int'
        !            61: # like 'unsigned long int'.
        !            62: 
        !            63: AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
        !            64: [
        !            65:   AC_CACHE_CHECK([for unsigned long long int],
        !            66:     [ac_cv_type_unsigned_long_long_int],
        !            67:     [AC_LINK_IFELSE(
        !            68:        [_AC_TYPE_LONG_LONG_SNIPPET],
        !            69:        [ac_cv_type_unsigned_long_long_int=yes],
        !            70:        [ac_cv_type_unsigned_long_long_int=no])])
        !            71:   if test $ac_cv_type_unsigned_long_long_int = yes; then
        !            72:     AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
        !            73:       [Define to 1 if the system has the type `unsigned long long int'.])
        !            74:   fi
        !            75: ])
        !            76: 
        !            77: # Expands to a C program that can be used to test for simultaneous support
        !            78: # of 'long long' and 'unsigned long long'. We don't want to say that
        !            79: # 'long long' is available if 'unsigned long long' is not, or vice versa,
        !            80: # because too many programs rely on the symmetry between signed and unsigned
        !            81: # integer types (excluding 'bool').
        !            82: AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
        !            83: [
        !            84:   AC_LANG_PROGRAM(
        !            85:     [[/* For now, do not test the preprocessor; as of 2007 there are too many
        !            86:         implementations with broken preprocessors.  Perhaps this can
        !            87:         be revisited in 2012.  In the meantime, code should not expect
        !            88:         #if to work with literals wider than 32 bits.  */
        !            89:       /* Test literals.  */
        !            90:       long long int ll = 9223372036854775807ll;
        !            91:       long long int nll = -9223372036854775807LL;
        !            92:       unsigned long long int ull = 18446744073709551615ULL;
        !            93:       /* Test constant expressions.   */
        !            94:       typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
        !            95:                     ? 1 : -1)];
        !            96:       typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
        !            97:                     ? 1 : -1)];
        !            98:       int i = 63;]],
        !            99:     [[/* Test availability of runtime routines for shift and division.  */
        !           100:       long long int llmax = 9223372036854775807ll;
        !           101:       unsigned long long int ullmax = 18446744073709551615ull;
        !           102:       return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
        !           103:              | (llmax / ll) | (llmax % ll)
        !           104:              | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
        !           105:              | (ullmax / ull) | (ullmax % ull));]])
        !           106: ])